Sasmal, Abhishek and Sen, Shrabanee and Devi, P Sujatha (2020) Frequency dependent energy storage and dielectric performance of Ba-Zr Co-doped BiFeO(3)loaded PVDF based mechanical energy harvesters: effect of corona poling. Soft Matter, 16 (36). pp. 8492-8505. ISSN 1744-683X

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Bi0.95Ba0.05Fe0.95Zr0.05O3(BBFZO) nanoparticles were synthesized by a sol-gel technique to develop a filler material with lower leakage current and oxygen vacancies compared to the host BiFeO3. In this work, we report the enhanced dielectric, ferroelectric, energy storage and energy harvesting performance of BBFZO incorporated PVDF composites. 15 wt% BBFZO loaded PVDF (15BBFZO) exhibited improved polarity (F(EA) = 77.42%) compared to neat PVDF (F(EA) = 37.01%). At an applied field of similar to 14 kV cm(-1)(1 Hz), this film (15BBFZO) exhibited a maximum energy storage density of 151.18 mu J cm(-3)(at 1 Hz). Upon repeated human finger tapping, an average open circuit peak to peak a.c. voltage (V-OC) similar to 20 V was obtained from 15BBFZO. A comprehensive study of frequency dependentD-Eloops and an extensive study of the effect of electrical poling on the output performance of the developed composite films have been performed. An improvement of the dipolar polarization was established through a frequency dependentD-Eloop study of unpoled and poled 15BBFZO and from other experiments. After poling the energy storage density andV(OC)of 15BBFZO were 154.66 mu J cm(-3)(at 1 Hz) and similar to 30 V, respectively. After rectification this output electrical signal was able to charge a 10 mu F commercial capacitor up to similar to 5.5 V. After poling, the energy storage efficiency (eta) of 15BBFZO also improved from 52.49% to 67.85% (at 1 Hz). The frequency dependence of the storage efficiency for all the samples has also been extensively investigated here. At 1 kHz,eta improved to 93.30% for poled 15BBFZO.

Item Type: Article
Subjects: Electronics
Divisions: Sensor and Actuator
Depositing User: Bidhan Chaudhuri
Date Deposited: 25 Jan 2021 10:57
Last Modified: 25 Jan 2021 10:57

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